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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8729

           Summary: parse!bool does not work correctly
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: jmdavisProg gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg gmx.com> 2012-09-26 10:29:46
PDT ---
This code

import std.conv;
import std.stdio;

void main()
{
    auto str = "123 456.7 false";

    auto i = parse!int(str);
    auto d = parse!double(str);
    auto b = parse!bool(str);

    assert(i == 123);
    assert(d == 456.7);
    assert(b == false);
}

results in this exception when you run it

std.conv.ConvException std/conv.d(2654): Can't parse string: bool should be
case-insensive 'true' or 'false'
----------------
./q(bool std.conv.parse!(bool, immutable(char)[]).parse(ref
immutable(char)[])+0x183) [0x43867b]
./q(_Dmain+0x42) [0x430ec2]
./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(main+0xd1) [0x43ab45]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7fd238fc1725]
----------------

If you change it to

import std.conv;
import std.stdio;

void main()
{
    auto str = "false 123 456.7";

    auto b = parse!bool(str);
    auto i = parse!int(str);
    auto d = parse!double(str);

    assert(i == 123);
    assert(d == 456.7);
    assert(b == false);
}

you get

std.conv.ConvException std/conv.d(1771): Unexpected ' ' when converting from
type string to type int
----------------
./q(int std.conv.parse!(int, immutable(char)[]).parse(ref
immutable(char)[])+0x1b8) [0x431984]
./q(_Dmain+0x33) [0x430eb3]
./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(main+0xd1) [0x43ab45]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f1286cc0725]
----------------

Just parsing out bool when it's first and then parsing _nothing_ else works,
but it seems like parsing it under any other circumstances fails (from what I
can tell anyway).

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monarchdodra gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |monarchdodra gmail.com


--- Comment #1 from monarchdodra gmail.com 2012-09-26 13:48:08 PDT ---
(In reply to comment #0)
 This code
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "123 456.7 false";
 
     auto i = parse!int(str);
     auto d = parse!double(str);
     auto b = parse!bool(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 results in this exception when you run it
 
 std.conv.ConvException std/conv.d(2654): Can't parse string: bool should be
 case-insensive 'true' or 'false'
 ----------------
 ./q(bool std.conv.parse!(bool, immutable(char)[]).parse(ref
 immutable(char)[])+0x183) [0x43867b]
 ./q(_Dmain+0x42) [0x430ec2]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7fd238fc1725]
 ----------------
 
 If you change it to
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "false 123 456.7";
 
     auto b = parse!bool(str);
     auto i = parse!int(str);
     auto d = parse!double(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 you get
 
 std.conv.ConvException std/conv.d(1771): Unexpected ' ' when converting from
 type string to type int
 ----------------
 ./q(int std.conv.parse!(int, immutable(char)[]).parse(ref
 immutable(char)[])+0x1b8) [0x431984]
 ./q(_Dmain+0x33) [0x430eb3]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f1286cc0725]
 ----------------
 
 Just parsing out bool when it's first and then parsing _nothing_ else works,
 but it seems like parsing it under any other circumstances fails (from what I
 can tell anyway).

Sounds like the implementation is looking for a literal "true" or "false", and
is forgetting to skip leading ws.

This works:

import std.conv;
import std.stdio;

void main()
{
   auto str = "123 456.7 false";

   auto i = parse!int(str);
   auto d = parse!double(str);
   str = str[1..$]; //manually skip ws.
   auto b = parse!bool(str);

   assert(i == 123);
   assert(d == 456.7);
   assert(b == false);
}

I can look into it for next week, unless somebody else solves it by then.

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--- Comment #2 from monarchdodra gmail.com 2012-09-26 13:52:15 PDT ---
(In reply to comment #1)
 (In reply to comment #0)
 This code
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "123 456.7 false";
 
     auto i = parse!int(str);
     auto d = parse!double(str);
     auto b = parse!bool(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 results in this exception when you run it
 
 std.conv.ConvException std/conv.d(2654): Can't parse string: bool should be
 case-insensive 'true' or 'false'
 ----------------
 ./q(bool std.conv.parse!(bool, immutable(char)[]).parse(ref
 immutable(char)[])+0x183) [0x43867b]
 ./q(_Dmain+0x42) [0x430ec2]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7fd238fc1725]
 ----------------
 
 If you change it to
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "false 123 456.7";
 
     auto b = parse!bool(str);
     auto i = parse!int(str);
     auto d = parse!double(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 you get
 
 std.conv.ConvException std/conv.d(1771): Unexpected ' ' when converting from
 type string to type int
 ----------------
 ./q(int std.conv.parse!(int, immutable(char)[]).parse(ref
 immutable(char)[])+0x1b8) [0x431984]
 ./q(_Dmain+0x33) [0x430eb3]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f1286cc0725]
 ----------------
 
 Just parsing out bool when it's first and then parsing _nothing_ else works,
 but it seems like parsing it under any other circumstances fails (from what I
 can tell anyway).

 
 Sounds like the implementation is looking for a literal "true" or "false", and
 is forgetting to skip leading ws.
 
 [SNIP]

Bigtime!

// string to bool conversions
Target parse(Target, Source)(ref Source s)
    if (isSomeString!Source && !is(Source == enum) &&
        is(Unqual!Target == bool))
{
    if (s.length >= 4 && icmp(s[0 .. 4], "true")==0)
    {
        s = s[4 .. $];
        return true;
    }
    if (s.length >= 5 && icmp(s[0 .. 5], "false")==0)
    {
        s = s[5 .. $];
        return false;
    }
    parseError("bool should be case-insensive 'true' or 'false'");
    assert(0);
}

I got this.

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--- Comment #3 from monarchdodra gmail.com 2012-09-26 14:36:53 PDT ---
FYI, parse!int also has the same problem. Only floating point types seem to
behave correctly:

import std.conv;
import std.stdio;

void main()
{
   auto str = "456.7 123";

   auto d = parse!double(str);
   auto i = parse!int(str);

   assert(d == 456.7);
   assert(i == 123);
}

On the split side, to! seems to parse things it should actually be rejecting:

import std.conv;
import std.stdio;

void main()
{
   auto str = "456.7 123";

   auto d = to!double(" 456.7"); //Passes, but shouldn't
   auto i = to!int(" 123"); //Correctly throws
}

Just logging here the bugs I find, still on this.

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monarchdodra gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED


--- Comment #4 from monarchdodra gmail.com 2012-09-27 13:40:52 PDT ---
(In reply to comment #0)
 This code
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "123 456.7 false";
 
     auto i = parse!int(str);
     auto d = parse!double(str);
     auto b = parse!bool(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 results in this exception when you run it
 
 std.conv.ConvException std/conv.d(2654): Can't parse string: bool should be
 case-insensive 'true' or 'false'
 ----------------
 ./q(bool std.conv.parse!(bool, immutable(char)[]).parse(ref
 immutable(char)[])+0x183) [0x43867b]
 ./q(_Dmain+0x42) [0x430ec2]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7fd238fc1725]
 ----------------
 
 If you change it to
 
 import std.conv;
 import std.stdio;
 
 void main()
 {
     auto str = "false 123 456.7";
 
     auto b = parse!bool(str);
     auto i = parse!int(str);
     auto d = parse!double(str);
 
     assert(i == 123);
     assert(d == 456.7);
     assert(b == false);
 }
 
 you get
 
 std.conv.ConvException std/conv.d(1771): Unexpected ' ' when converting from
 type string to type int
 ----------------
 ./q(int std.conv.parse!(int, immutable(char)[]).parse(ref
 immutable(char)[])+0x1b8) [0x431984]
 ./q(_Dmain+0x33) [0x430eb3]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
 ./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
 delegate())+0x2a) [0x43abba]
 ./q(main+0xd1) [0x43ab45]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f1286cc0725]
 ----------------
 
 Just parsing out bool when it's first and then parsing _nothing_ else works,
 but it seems like parsing it under any other circumstances fails (from what I
 can tell anyway).

https://github.com/D-Programming-Language/phobos/pull/817

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--- Comment #5 from Kenji Hara <k.hara.pg gmail.com> 2012-09-27 18:29:09 PDT ---
(In reply to comment #3)
 FYI, parse!int also has the same problem. Only floating point types seem to
 behave correctly:

NO, this is just a bug in `T parse!T(input) if (isFloatingPoint!T)`.
The parse function family should not skip leading white spaces implicitly.

I think it is simple, no special cases, and flexible design.

See also my github comment to the pull#817:
https://github.com/D-Programming-Language/phobos/pull/817#issuecomment-8960280

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--- Comment #6 from github-bugzilla puremagic.com 2012-10-04 09:33:06 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/dce93b188140157732898da3d03fcfe90d32e555
fix issue 8729 do not skip leading ws

https://github.com/D-Programming-Language/phobos/commit/25c4328aef80230596c90bebb6848f5e2f228261
Merge pull request #833 from monarchdodra/bug8729

fix issue 8729 do not skip leading ws in parse (again)

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Jonathan M Davis <jmdavisProg gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


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